Perlite Roof Insulation R Value

R value is used in the united states.

Perlite roof insulation r value.

For example two inches of extruded polystyrene with an r value of 11 has an rsi of 1. Perlite roof insulation code compliance thermal performance 1 thickness nominal r value resistance inches mm hr ft 2 f btu m c w 3 4 19 1 2 0 0 35 1 25 4 2 7 0 48 1 1 2 38 1 4 1 0 72 2 51 5 4 0 95 3 76 8 1 1 47 for use over metal decks the minimum thickness of energyguard perlite insulation over metal decks is as follows. Factory cut taper that is easy to install and cut builds slope into an otherwise flat roofing system allowing water to drain freely off the roof. The r value of the insulating concrete depends on its unit weight and thickness.

The bag in which the perlite or vermiculite is purchased recommends the mix proportions needed to achieve various unit weights of fresh concrete and oven dry concrete. To convert rsi to r value multiply the rsi by 5 67826. Low thermal insulation board. Provides good dimensional stability excellent insulation value with stable r value and fire resistance.

To convert the r value of a specific thickness of a material to rsi divide the r value by 5 67826. Consists of recycled newsprint to. Rsi r value système international is the metric equivalent. The surface is treated to reduce bitumen absorption assuring proper adhesion of roof membranes.